Discharge calculation for STP ETP

REF. WASTE WATER ENGINEERING BY METCALF & EDDY PP 28 TABLES 2-11

HOSPITAL EFFLUENT TREATMENT PLANT :

Discharge Calculation:

OPTION-I

.

The proposed hospital will have ------ beds.(Number of bed mentioned in municipality records or other govt document)

1. Bed in Hospital= Nos @ 500 liter per bed = Liter 

2. Employee in Hospital = nos @ 40 liter per employee= Liter

3.Hostels- Persons = nos @ 150 liters per person.= Liter

4.Kitchen Meals= nos@ 10 liter per meal = Liter

So, Total Quantity of discharge: --------- liter per day

Discharge Calculation:

OPTION-II

Total water purchased or drawn from bore well = A  Liter/day (Bill of water purchase or flow meter reading of bore well)

Quantity of Effluent , liter per day = 80 % of ( A )

WASTE WATER FLOW RATES IN DIFFERENT UNITS:
Waste water consist primarily of used water, the water that reaches the sewer .

For different units it is different as shown in the chart .

Source	Unit	Range l/u/d	Typical l/u/d
Apartment	Person	200-340	260
Hotel resident	Resident	150-220	190
Hotel Employee	Employee	30-50	40
Individual Home	Person	190-350	280
Airport	Passenger	8-15	10
Automobile service station	Vehicle served	150-200	200
Restaurant	Meal	8-15	10
Office	Employee	30-65	55
Laundry	Machine	1800-2600	2200
Laundry	Wash	180-200	190
Hospital medical	Bed Employee	500-950 20-60	650 40
School	Student	20-65	40
School boarding	Student	200-400	280
For Industries		80% of water used used in production will be released as waste water
Meat processing	Mg	15-20 cu mtr/ Mg
Milk Products	Mg	10-20 cu mtr/Mg
Bread	Mg	2-4 cu mt/Mg
Beer	Mg	10-16 cu mtr/Mg
Whisky	Mg	60-80 cu mtr/Mg
Paper Pulp	Mg	250-800 cu mt/ Mg
Paper	Mg	120-160 cu mtr/Mg
Textile Bleaching (Cotton)	Mg	200-300 cu mtr/Mg
Textile Dyeing (Cotton)	Mg	30-60 cu mtr/Mg

REF : WASTE WATER ENGINEERING : TREATMENT , DISPOSAL AND REUSE

--- METCALF & EDDY .

NGOs in working on water/gender in Delhi

NGOs in working on water/gender in Delhi

I am a student in Australia and hope to be undertaking fieldwork in Delhi next year. I am interested in obtaining contact details of NGO's working with women on water-related issues (water scarcity and water security) in the slum areas of Delhi. Also, I would appreciate any local government, or municipal programmes and projects that are specifically targetting water issues within slum areas of Delhi.  Mary Scott maryscott29@gmail.com

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Responses

25 Feb, 2008   |  Bhawna Vajpai

Dear Mary, Although many organization might be working, I know about Development Alternative on water and environment issue in slums (www.devalt.org), PRIA-Gender (www.pria.org) and water Aid India-Water and sanitation India. I can be more helpful, if get specific requirement. Bhawna Vajpai Water and Sanitation Consultant

http://www.indiawaterportal.org/Network/askq/kb/?View=entry&EntryID=117

Calculations!:Aeration Tank Volume, HRT, MLSS Values.

Calculations!:Aeration Tank Volume, HRT, MLSS Values.

I am working in a STP & ETP plant. I need to know how to calculate: 1. Volume of Aeration tank 2. HRT 3. F/M Ratio 4. MLSS value. The relevant details of the ETP are as below: Influent flow = 10 m3 / day In. flow BOD = 1200 mg / L In.flow COD = 2200 mg / L TSS  = 850 mg / L   Jeyaroopa   jeyaroopa79@gmail.com Dear Jayroopa You may please refer Water & Waste Water Engineering by Metcalf & Eddy. BOD of effluent is 1200 mg/l. It will be difficult to bring down the BOD by Activated Sludge process to desire permissible limits. Simplified method of calculation is as below. Process Activated sludge Flo3, CUM 10 Type Extended aeration Food to Microorganism ratio (F/M) 0.15 Total BOD load, Kg BOD*Flow/1000.= 12 Total mixed liquor suspended solids(MLSS) Total BOD/(F/M) = 80 kg MLSS in Tank say mg/l 3000 Volume of tank, CUM Total MLSS/(MLSS/1000) = 26.6 Retention time, hr 24*Volume of Tank/Flow = 63.84 You can select F/M & MLSS values and optiimise the volume of a tank. The waste water has high suspended solids therefore sedimentation is must. Maximum efficiency of Activated sludge process is 95% therefore if you need lower value of BOD in treated effluent then you have to opt two stage process. For further information please contact Prof. R. V. Saraf Director Viraj Envirozing India Pvt. Ltd. 21 Radhakrishna Near SBI, Paud Road, Pune 38 watersgs@vsnl.net 13 Aug, 2008   |  Taral Kumar Dear Jeyaroopa, Though the calculation is not that simple, I will give you a thumb rule. Multiply BOD with Quantity of effluent and divide it by 500 to get aeration tank volume. For example, for 10 cum/day with 1200 BOD, aeration tank volume shall be 10 x 1200 / 500 = 24 cum. That is 2.5 days storage nearly. But that is because the BOD is excessively high. With best regards, Taral Kumar Executive Director Akar Impex Pvt. Ltd. Noida, Uttar Pradesh http://www.indiawaterportal.org/Network/askq/kb/?View=entry&EntryID=343